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24.0 Porphyritic hornblende latite. Jamestown, California. White phenocrysts of feldspars and brown-weathered hornblende occur in the dark gray aphanitic matrix. [Scale is standard GSA scale with mm diameter dots of 1 mm to 5 mm diameter.]
Image 53 of 156
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![24.0 Porphyritic hornblende latite. Jamestown, California. White phenocrysts of feldspars and brown-weathered hornblende occur in the dark gray aphanitic matrix. [Scale is standard GSA scale with mm diameter dots of 1 mm to 5 mm diameter.]](../24.0.JPG)